Table 3

Descriptive statistics for all the environmental variables investigated

StatisticMost freq. size (nm)Mean size (nm)Part. conc. (parts/mL)Dissolved conc. (μg/L)pHConductivity (μS/cm)Turbidity (NTU)TDS (ppm)Tyrosine-like (Intensity, RU)Tryptophan-like (Intensity, RU)Fulvic acid-like (Intensity, RU)Microbial by-product-like (Intensity, RU)Humic acid-like (Intensity, RU)
No. of observations 5 5 5 5 5 5 5 5 5 5 5 5 5 
Minimum 102.910 118.677 83,117.970 14.870 7.450 42.200 5.800 20.700 0.021 0.031 0.176 0.054 0.528 
Maximum 158.923 168.043 138,401.900 243.940 8.700 540.667 158.700 268.100 0.068 0.086 0.191 0.154 0.704 
Range 56.013 49.367 55,283.930 229.070 1.250 498.467 152.900 247.400 0.047 0.055 0.015 0.100 0.176 
1st Quartile 103.160 118.810 87,692.955 15.187 7.533 50.533 32.667 20.700 0.040 0.053 0.176 0.110 0.552 
Median 124.845 131.650 123,186.890 93.905 8.100 131.650 43.400 25.033 0.062 0.053 0.177 0.137 0.567 
3rd Quartile 136.410 141.900 130,194.873 131.405 8.367 150.500 66.400 76.000 0.065 0.055 0.189 0.143 0.609 
Mean 125.250 135.816 112,518.918 99.861 8.030 183.110 61.393 82.107 0.051 0.056 0.182 0.119 0.592 
Variance (n) 449.129 335.186 515,383,592.585 7,236.494 0.230 33,798.103 2,746.651 9,085.947 0.000 0.000 0.000 0.001 0.004 
Variance (n-1) 561.412 418.983 644,229,490.732 9,045.617 0.288 42,247.629 3,433.314 11,357.434 0.000 0.000 0.000 0.002 0.005 
Standard deviation (n) 21.193 18.308 22,702.061 85.068 0.480 183.843 52.408 95.320 0.018 0.018 0.007 0.036 0.062 
Standard deviation (n-1) 23.694 20.469 25,381.676 95.108 0.536 205.542 58.594 106.571 0.020 0.020 0.007 0.040 0.069 
Variation coefficient 0.169 0.135 0.202 0.852 0.060 1.004 0.854 1.161 0.356 0.314 0.036 0.300 0.104 
StatisticMost freq. size (nm)Mean size (nm)Part. conc. (parts/mL)Dissolved conc. (μg/L)pHConductivity (μS/cm)Turbidity (NTU)TDS (ppm)Tyrosine-like (Intensity, RU)Tryptophan-like (Intensity, RU)Fulvic acid-like (Intensity, RU)Microbial by-product-like (Intensity, RU)Humic acid-like (Intensity, RU)
No. of observations 5 5 5 5 5 5 5 5 5 5 5 5 5 
Minimum 102.910 118.677 83,117.970 14.870 7.450 42.200 5.800 20.700 0.021 0.031 0.176 0.054 0.528 
Maximum 158.923 168.043 138,401.900 243.940 8.700 540.667 158.700 268.100 0.068 0.086 0.191 0.154 0.704 
Range 56.013 49.367 55,283.930 229.070 1.250 498.467 152.900 247.400 0.047 0.055 0.015 0.100 0.176 
1st Quartile 103.160 118.810 87,692.955 15.187 7.533 50.533 32.667 20.700 0.040 0.053 0.176 0.110 0.552 
Median 124.845 131.650 123,186.890 93.905 8.100 131.650 43.400 25.033 0.062 0.053 0.177 0.137 0.567 
3rd Quartile 136.410 141.900 130,194.873 131.405 8.367 150.500 66.400 76.000 0.065 0.055 0.189 0.143 0.609 
Mean 125.250 135.816 112,518.918 99.861 8.030 183.110 61.393 82.107 0.051 0.056 0.182 0.119 0.592 
Variance (n) 449.129 335.186 515,383,592.585 7,236.494 0.230 33,798.103 2,746.651 9,085.947 0.000 0.000 0.000 0.001 0.004 
Variance (n-1) 561.412 418.983 644,229,490.732 9,045.617 0.288 42,247.629 3,433.314 11,357.434 0.000 0.000 0.000 0.002 0.005 
Standard deviation (n) 21.193 18.308 22,702.061 85.068 0.480 183.843 52.408 95.320 0.018 0.018 0.007 0.036 0.062 
Standard deviation (n-1) 23.694 20.469 25,381.676 95.108 0.536 205.542 58.594 106.571 0.020 0.020 0.007 0.040 0.069 
Variation coefficient 0.169 0.135 0.202 0.852 0.060 1.004 0.854 1.161 0.356 0.314 0.036 0.300 0.104 
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